... to both components. Its capacity is limited and therefore it must process the appropriate amount of activity incurring in the sketch pad and phonological loop to provide the best resources for a task. Research into the involvement of the central executive and how it works is limited. However, advances have been made into the understanding of the component, and beliefs include that it is comprised of subprocesses including task co-ordination, planning and control of action. The main basis of research has surrounded the latter of these three, and the 'control of action' model (Shallice, 1988). For this reason it is the basis of my explanation of the central executive. The model describes the central executive as guiding automatic action (schemas) using environmental triggers (presented as phonological and sketchpad elements). Whilst driving, for example, our driving schema takes over. The sight of a zebra crossing in front induces an environmental trigger to ...

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